@charset "utf-8";
*{
    margin: 0;
    padding: 0;
}
.main{
    width: 500px;
    margin: 0 auto;
}
header{
    width: 100%;
}
.left{
    float: left;
}

.right{
    float: right;
}
.clear:after{
    content: "";
    display: block;
    clear: both;
}